💚 add backports to fix vcr on Ruby 2.4

Author: pboling

.idea/oauth.iml

@@ -34,7 +34,7 @@
   "lib/oauth/tokens/consumer_token.rb:3696415131": [
     [9, 5, 155, "Style/ClassMethodsDefinitions: Use `class << self` to define a class method.", 349576019]
   ],
-  "oauth.gemspec:3033391650": [
+  "oauth.gemspec:1987611209": [
     [133, 3, 56, "Gemspec/DependencyVersion: Dependency version specification is required.", 644892567],
     [153, 3, 40, "Gemspec/DependencyVersion: Dependency version specification is required.", 2300588954],
     [155, 3, 44, "Gemspec/DependencyVersion: Dependency version specification is required.", 1905290578],

.rubocop_gradual.lock

@@ -498,6 +498,7 @@ PLATFORMS
 
 DEPENDENCIES
   appraisal2 (~> 3.0)
+  backports (~> 3.25, >= 3.25.1)
   benchmark (~> 0.4, >= 0.4.1)
   bundler-audit (~> 0.9.2)
   debug (>= 1.1)

Gemfile.lock

@@ -190,9 +190,7 @@ Thanks, |7eter l-|. l3oling
   spec.add_development_dependency("gitmoji-regex", "~> 1.0", ">= 1.0.3")            # ruby >= 2.3.0
 
   # HTTP recording for deterministic specs
-  # It seems that somehow just having a newer version of appraisal installed breaks
-  #   Ruby 2.3 and 2.4 even if their bundle specifies an older version,
-  #   and as a result it can only be a dependency in the appraisals.
+  # Ruby 2.3 / 2.4 can fail with:
   # | An error occurred while loading spec_helper.
   # | Failure/Error: require "vcr"
   # |
@@ -202,6 +200,8 @@ Thanks, |7eter l-|. l3oling
   # | # ./spec/config/vcr.rb:3:in `<top (required)>'
   # | # ./spec/spec_helper.rb:8:in `require_relative'
   # | # ./spec/spec_helper.rb:8:in `<top (required)>'
-  spec.add_development_dependency("vcr", ">= 4")                      # 6.0 claims to support ruby >= 2.3, but fails on ruby 2.4
-  spec.add_development_dependency("webmock", ">= 3")               # Last version to support ruby >= 2.3
+  # So that's why we need backports.
+  spec.add_development_dependency("backports", "~> 3.25", ">= 3.25.1")  # ruby >= 0
+  spec.add_development_dependency("vcr", ">= 4")                        # 6.0 claims to support ruby >= 2.3, but fails on ruby 2.4
+  spec.add_development_dependency("webmock", ">= 3")                    # Last version to support ruby >= 2.3
 end

oauth.gemspec

@@ -0,0 +1,4 @@
+# frozen_string_literal: true
+
+require "backports/2.5.0/hash/transform_keys"
+require "backports/2.5.0/string/delete_prefix"

spec/ext/backports.rb

@@ -1,6 +1,9 @@
 # frozen_string_literal: true
 
-# External libs
+# Global Extensions
+require_relative "ext/backports"
+
+# External libraries
 # N/A
 
 # External RSpec & related config